EP0531755A1 - Method for producing hot wide strip - Google Patents

Method for producing hot wide strip Download PDF

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Publication number
EP0531755A1
EP0531755A1 EP92114047A EP92114047A EP0531755A1 EP 0531755 A1 EP0531755 A1 EP 0531755A1 EP 92114047 A EP92114047 A EP 92114047A EP 92114047 A EP92114047 A EP 92114047A EP 0531755 A1 EP0531755 A1 EP 0531755A1
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EP
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Prior art keywords
strip
stand
rolling
hearth furnace
train
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Granted
Application number
EP92114047A
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German (de)
French (fr)
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EP0531755B1 (en
Inventor
Wolfgang Prof. Dr. Rohde
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
Schloemann Siemag AG
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Application filed by SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP0531755A1 publication Critical patent/EP0531755A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically

Definitions

  • the invention relates to a rolling mill for the production of hot strip, consisting of a single or multi-stand roughing mill and a multi-stand finishing mill, which are preceded by a high pressure descaling and a cropping shear.
  • Conventional-type hot strip mills consist of a roughing train and a finishing train.
  • the roughing mill the roughing slab, 200 to 300 mm thick, is rolled out in several passes to an intermediate thickness of 25 to 60 mm.
  • the roughing mill generally consists of several rolling stands. At least one reversing scaffold is required.
  • the belt After the last stitch in the roughing train, the belt is led over the roller table to the finishing train. It goes through the cropping shear and high pressure descaling.
  • the temperature is approximately the same over the entire length of the strip. After tapping in the first stand, however, the rolling temperature in the first stand drops steadily due to the radiation and convection to the environment.
  • coil weights For example, from 20 kg / mm coil width, the temperature drop at the end of the strip is already approx. 150 ° C.
  • finishing train were operated at a constant speed, the appearance with lower temperature levels would also show up in the other stands of the finishing train. Ultimately, the final rolling temperature on the last stand, which is decisive for the technological properties of the strip, would drop significantly from the beginning of the strip to the end of the strip.
  • the speed of the finishing train is continuously increased during the rolling time from the beginning of the strip to the end of the strip.
  • the consequently increasing forming capacity on all stands causes the strip to be reheated, which, if the degrees of acceleration are selected correctly, results in a constant rolling temperature in the last stand.
  • the process is disadvantageous in several ways. Due to the increased forming speeds and the still existing temperature drop in the front stands, there is a noticeable increase in the rolling forces and the rolling moments over the strip length. The resulting changes in the mill stretch and in the bending of the roller sets have to be eliminated by complex control and regulation mechanisms. The amount of heat to be dissipated in the cooling section increases steadily with increasing speed. Depending on the speed, additional cooling zones must be activated, which means that irregularities in the reel temperature reached are unavoidable. Ultimately, uniform cooling of the strip over the length of the strip at the same cooling speeds becomes impossible.
  • the object of the present invention is to change a hot strip mill by suitable measures so that the rolling speed from the beginning of the strip to the end of the strip can be kept constant without changing the rolling temperatures in the individual stands.
  • Skidmarks are cold spots in the supporting strip at regular intervals due to the contact of the preliminary slab with the water-cooled support rails in the slab furnace.
  • the skid marks are largely eliminated as they pass through the heated roller hearth furnace 5, so that there is a significant reduction in the known disturbances in the rolling force and thus in the thickness of the strip to be rolled.
  • Another advantage is the reduction in the drive power required for finishing train 2, since the power required for acceleration is eliminated.
  • the construction of the cooling section 8 is considerably simplified. The cooling at constant speed enables the driving of predetermined temperature curves to achieve certain technological properties, which can be maintained for each strip point over the entire strip length. This opens up new possibilities for optimizing thermomechanical effects.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Preparation Of Fruits And Vegetables (AREA)
  • Noodles (AREA)
  • Glass Compositions (AREA)

Abstract

In a rolling train for producing hot wide strip comprising a single- or multiple-stand roughing train 1 and a multi-stand finishing train 2 which is preceded by a high-pressure descaling device 3 and a cropping shear 4, it is proposed to arrange between the last stand of the roughing train 1 and the cropping shear 4 a roller hearth furnace 5 which allows a setting and maintenance of a constant temperature over the entire length of the strip. <IMAGE>

Description

Die Erfindung betrifft eine Walzstraße zur Erzeugung von Warmbreitband, bestehend aus einer ein- oder mehrgerüstigen Vorstraße und einer mehrgerüstigen Fertigstraße, der eine Hochdruckentzunderung und eine Schopfschere vorgeordnet sind.The invention relates to a rolling mill for the production of hot strip, consisting of a single or multi-stand roughing mill and a multi-stand finishing mill, which are preceded by a high pressure descaling and a cropping shear.

Warmbreitbandstraßen konventioneller Bauart bestehen aus einer Vorstraße und einer Fertigstraße. In der Vorstraße wird die Vorbramme von 200 bis 300 mm Dicke in mehreren Stichen auf eine Zwischendicke von 25 bis 60 mm ausgewalzt. Die Vorstraße besteht im allgemeinen aus mehreren Walzgerüsten. Mindestens ist ein Reversiergerüst erforderlich.Conventional-type hot strip mills consist of a roughing train and a finishing train. In the roughing mill, the roughing slab, 200 to 300 mm thick, is rolled out in several passes to an intermediate thickness of 25 to 60 mm. The roughing mill generally consists of several rolling stands. At least one reversing scaffold is required.

Nach dem letzten Stich in der Vorstraße wird das Band über den Rollgang zur Fertigstraße geführt. Es durchläuft hierbei die Schopfschere und die Hochdruckentzunderung.After the last stitch in the roughing train, the belt is led over the roller table to the finishing train. It goes through the cropping shear and high pressure descaling.

Zu dem Zeitpunkt, zu dem sich der Bandkopf in der Schopfschere befindet, besteht über die gesamte Vorbandlänge eine in etwa gleiche Temperatur. Nach dem Anstich im ersten Gerüst fällt jedoch die Walztemperatur im ersten Gerüst infolge der Strahlung und Konvektion an die Umgebung stetig ab. Bei üblichen Coilgewichten von z.B. 20 kg/mm Coilbreite beträgt der Temperaturabfall am Bandende bereits ca. 150°C.At the point in time at which the strip head is in the cropping shear, the temperature is approximately the same over the entire length of the strip. After tapping in the first stand, however, the rolling temperature in the first stand drops steadily due to the radiation and convection to the environment. With usual coil weights For example, from 20 kg / mm coil width, the temperature drop at the end of the strip is already approx. 150 ° C.

Würde die Fertigstraße mit konstanter Geschwindigkeit betrieben, so würde sich die Erscheinung mit jeweils tieferliegendem Temperaturniveau auch in den weiteren Gerüsten der Fertigstraße zeigen. Letztlich würde auch die für die technologischen Eigenschaften des Bandes entscheidende Endwalztemperatur am letzten Gerüst vom Bandanfang zum Bandende deutlich abfallen.If the finishing train were operated at a constant speed, the appearance with lower temperature levels would also show up in the other stands of the finishing train. Ultimately, the final rolling temperature on the last stand, which is decisive for the technological properties of the strip, would drop significantly from the beginning of the strip to the end of the strip.

Um dies zu vermeiden, wird die Geschwindigkeit der Fertigstraße während der Walzzeit vom Bandanfang zum Bandende stetig erhöht. Die hierdurch an allen Gerüsten stetig zunehmende Umformleistung bewirkt eine Wiedererwärmung des Bandes, die bei richtiger Wahl der Beschleunigungsgrade eine konstante Walztemperatur im letzten Gerüst zur Folge hat.In order to avoid this, the speed of the finishing train is continuously increased during the rolling time from the beginning of the strip to the end of the strip. The consequently increasing forming capacity on all stands causes the strip to be reheated, which, if the degrees of acceleration are selected correctly, results in a constant rolling temperature in the last stand.

Das Verfahren ist in mehrfacher Hinsicht nachteilig. Durch die erhöhten Umformgeschwindigkeiten sowie durch den immer noch vorhandenen Temperaturabfall in den vorderen Gerüsten ergibt sich über die Bandlänge ein spürbarer Anstieg der Walzkräfte und der Walzmomente. Die sich hieraus ergebenden Veränderungen in der Gerüstdehnung und in der Biegung der Walzensätze müssen durch aufwendige Kontroll- und Regelmechanismen beseitigt werden. Die in der Kühlstrecke abzuführende Wärmemenge nimmt mit steigender Geschwindigkeit stetig zu. Abhängig von der Geschwindigkeit müssen weitere Kühlzonen zugeschaltet werden, wodurch Ungleichförmigkeiten in der erreichten Haspeltemperatur unvermeidlich sind. Letztlich wird eine über die Bandlänge gleichförmige Kühlung des Bandes mit gleichen Abkühlgeschwindigkeiten unmöglich.The process is disadvantageous in several ways. Due to the increased forming speeds and the still existing temperature drop in the front stands, there is a noticeable increase in the rolling forces and the rolling moments over the strip length. The resulting changes in the mill stretch and in the bending of the roller sets have to be eliminated by complex control and regulation mechanisms. The amount of heat to be dissipated in the cooling section increases steadily with increasing speed. Depending on the speed, additional cooling zones must be activated, which means that irregularities in the reel temperature reached are unavoidable. Ultimately, uniform cooling of the strip over the length of the strip at the same cooling speeds becomes impossible.

Aufgabe der vorliegenden Erfindung ist es, eine Warmbandstraße durch geeignete Maßnahmen so zu verändern, daß die Walzgeschwindigkeit vom Bandanfang zum Bandende konstant gehalten werden kann, ohne daß sich die Walztemperaturen in den einzelnen Gerüsten verändern.The object of the present invention is to change a hot strip mill by suitable measures so that the rolling speed from the beginning of the strip to the end of the strip can be kept constant without changing the rolling temperatures in the individual stands.

Zur Lösung dieser Aufgabe wird - wie in der Zeichnung dargestellt - vorgeschlagen, zwischen dem letzten Gerüst der Vorstraße 1 und der Schopfschere 4 einen Rollenherdofen 5 anzuordnen, der die Temperatur des von der Vorstraße 1 kommenden Bandes 7 über die gesamte Bandlänge auf einen einheitlichen Wert abgleicht und konstant hält. Das Band 7 verläßt mit dieser Temperatur den Rollenherdofen 5 mit einer Geschwindigkeit, die der Anstichgeschwindigkeit im ersten Gerüst der Fertigstraße 2 entspricht. Die Geschwindigkeit der Fertigstraße 2 wird erfindungsgemäß nicht verändert. Da die Durchlaufzeit für die Strecke vom Ende des Rollenherdofens 5 bis zum Walzspalt des ersten Gerüstes bei gleicher Geschwindigkeit für alle spät einlaufenden Teile des Bandes 7 gleich ist, bleibt auch die Walztemperatur im ersten Gerüst und in allen anderen Walzgerüsten konstant. Letztlich kann durch Wahl dieser für die gesamte Bandlänge konstanten Walzgeschwindigkeit in Abhängigkeit von der Ofentemperatur und der Banddicke jede gewünschte Endwalztemperatur eingestellt werden.To solve this problem - as shown in the drawing - it is proposed to arrange a roller hearth furnace 5 between the last scaffolding of the roughing mill 1 and the cropping shear 4, which furnace oven adjusts the temperature of the belt 7 coming from the roughing mill 1 to a uniform value over the entire belt length and keeps constant. The belt 7 leaves the roller hearth furnace 5 at this temperature at a speed which corresponds to the tapping speed in the first stand of the finishing train 2. The speed of the finishing train 2 is not changed according to the invention. Since the throughput time for the distance from the end of the roller hearth furnace 5 to the roll gap of the first stand at the same speed is the same for all late arriving parts of the strip 7, the roll temperature in the first stand and in all other roll stands remains constant. Ultimately, by selecting this constant rolling speed for the entire strip length, depending on the furnace temperature and strip thickness, any desired final rolling temperature can be set.

Bei Betrieb der Fertigstraße 2 in der vorgeschlagenen Art ergeben sich konstante Walzkräfte und Walzmomente über die gesamte Bandlänge. Die zur Erzielung bestimmter Haspeltemperaturen zu aktivierenden Teile der vor dem Haspel 9 angeordneten Kühlstrecke 8 bleiben ebenfalls konstant. Gleiche Abkühlgeschwindigkeiten über die gesamte Bandlänge sind gesichert. Die Haspeltemperatur kann innerhalb geringer Toleranzen konstant gehalten werden.When the finishing train 2 is operated in the manner proposed, constant rolling forces and rolling torques result over the entire length of the strip. The parts of the cooling section 8 arranged in front of the reel 9 to be activated in order to achieve certain reel temperatures also remain constant. The same cooling speeds are ensured over the entire length of the belt. The reel temperature can be kept constant within narrow tolerances.

Ein weiterer Vorteil ist die weitgehende Auflösung der sogenannten Skidmarks im Vorband. Skidmarks sind in regelmäßigen Abständen im Vorband vorhandene kältere Stellen infolge des Kontaktes der Vorbramme mit den wassergekühlten Auflageschienen im Brammenofen. Die Skidmarks werden beim Durchlauf durch den beheizten Rollenherdofen 5 weitgehend eliminiert, so daß eine deutliche Minderung der bekannten Störungen in der Walzkraft und damit in der Dicke des zu walzenden Bandes eintritt.Another advantage is the extensive dissolution of the so-called skidmarks in the opening act. Skidmarks are cold spots in the supporting strip at regular intervals due to the contact of the preliminary slab with the water-cooled support rails in the slab furnace. The skid marks are largely eliminated as they pass through the heated roller hearth furnace 5, so that there is a significant reduction in the known disturbances in the rolling force and thus in the thickness of the strip to be rolled.

Ein weiterer Vorteil ist die Minderung der erforderlichen Antriebsleistung für die Fertigstraße 2, da die zur Beschleunigung erforderliche Leistung entfällt. Die Konstruktion der Kühlstrecke 8 wird wesentlich vereinfacht. Die Kühlung mit konstanter Geschwindigkeit ermöglicht das Fahren vorgegebener Temperaturkurven zur Erzielung bestimmter technologischer Eigenschaften, die für jeden Bandpunkt über die gesamte Bandlänge eingehalten werden können. Hierdurch eröffnen sich neue Möglichkeiten zur Optimierung thermomechanischer Effekte.Another advantage is the reduction in the drive power required for finishing train 2, since the power required for acceleration is eliminated. The construction of the cooling section 8 is considerably simplified. The cooling at constant speed enables the driving of predetermined temperature curves to achieve certain technological properties, which can be maintained for each strip point over the entire strip length. This opens up new possibilities for optimizing thermomechanical effects.

Claims (4)

Walzstraße zur Erzeugung von Warmbreitband,
bestehend aus einer ein- oder mehrgerüstigen Vorstraße (1) und einer mehrgerüstigen Fertigstraße (2), der eine Hochdruckentzunderung (3) und eine Schopfschere (4) vorgeordnet sind,
dadurch gekennzeichnet,
daß zwischen dem letzten Gerüst der Vorstraße (1) und der Schopfschere (4) ein Rollenherdofen (5) angeordnet ist, der die Einstellung und die Einhaltung einer über die gesamte Bandlänge konstanten Temperatur ermöglicht.Rolling mill for the production of hot wide strip,
Consisting of a single or multi-stand roughing mill (1) and a multi-stand finishing mill (2), which are preceded by a high pressure descaling (3) and a cropping shear (4),
characterized,
that a roller hearth furnace (5) is arranged between the last stand of the roughing mill (1) and the cropping shear (4), which enables the setting and maintenance of a constant temperature over the entire length of the strip. Walzstraße nach Anspruch 1,
dadurch gekennzeichnet,
daß zur Einhaltung einer konstanten Endwalztemperatur die Fertigstraße (2) mit konstanter Walzgeschwindigkeit betreibbar ist.Rolling mill according to claim 1,
characterized,
that the finishing train (2) can be operated at a constant rolling speed in order to maintain a constant final rolling temperature. Walzstraße nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß der Rollenherdofen (5) gas- oder ölbeheizbar ist.Rolling mill according to claim 1 or 2,
characterized,
that the roller hearth furnace (5) is gas or oil-heated. Walzstraße nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet,
daß dem gas- oder ölbeheizten Rollenherdofen (5) eine Induktionsheizstrecke (6) vorgeordnet ist.Rolling mill according to claim 1, 2 or 3,
characterized,
that the gas or oil-heated roller hearth furnace (5) is preceded by an induction heating section (6).
EP92114047A 1991-09-09 1992-08-18 Method for producing hot wide strip Revoked EP0531755B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4129749 1991-09-09
DE4129749A DE4129749A1 (en) 1991-09-09 1991-09-09 ROLLING MILL FOR THE PRODUCTION OF HOT BROADBAND

Publications (2)

Publication Number Publication Date
EP0531755A1 true EP0531755A1 (en) 1993-03-17
EP0531755B1 EP0531755B1 (en) 1995-12-13

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ID=6440073

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Application Number Title Priority Date Filing Date
EP92114047A Revoked EP0531755B1 (en) 1991-09-09 1992-08-18 Method for producing hot wide strip

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EP (1) EP0531755B1 (en)
JP (1) JP3262379B2 (en)
AT (1) ATE131422T1 (en)
DE (2) DE4129749A1 (en)
ES (1) ES2081004T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0810044A1 (en) * 1996-05-28 1997-12-03 Nkk Corporation Method for making hot-rolled steel sheet and apparatus therefor
EP0919296A1 (en) * 1997-11-21 1999-06-02 Sms Schloemann-Siemag Aktiengesellschaft Adaption of hot rolling lines for rolling thin strips

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2559222A1 (en) * 1975-12-30 1977-07-14 Nippon Steel Corp METHOD OF HOT ROLLING STRIP AND HOT STRIP ROLLING MILL
US4444038A (en) * 1981-09-29 1984-04-24 Tippins Machinery Company, Inc. Method of modernizing a hot strip mill
EP0320846A1 (en) * 1987-12-18 1989-06-21 Hitachi, Ltd. Apparatus and method for hot-rolling slab into sheets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2559222A1 (en) * 1975-12-30 1977-07-14 Nippon Steel Corp METHOD OF HOT ROLLING STRIP AND HOT STRIP ROLLING MILL
US4444038A (en) * 1981-09-29 1984-04-24 Tippins Machinery Company, Inc. Method of modernizing a hot strip mill
EP0320846A1 (en) * 1987-12-18 1989-06-21 Hitachi, Ltd. Apparatus and method for hot-rolling slab into sheets

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0810044A1 (en) * 1996-05-28 1997-12-03 Nkk Corporation Method for making hot-rolled steel sheet and apparatus therefor
US5927118A (en) * 1996-05-28 1999-07-27 Nkk Corporation Method for making hot-rolled steel sheet and apparatus therefor
EP0919296A1 (en) * 1997-11-21 1999-06-02 Sms Schloemann-Siemag Aktiengesellschaft Adaption of hot rolling lines for rolling thin strips

Also Published As

Publication number Publication date
ES2081004T3 (en) 1996-02-16
DE59204667D1 (en) 1996-01-25
ATE131422T1 (en) 1995-12-15
EP0531755B1 (en) 1995-12-13
DE4129749A1 (en) 1993-03-11
JPH06315710A (en) 1994-11-15
JP3262379B2 (en) 2002-03-04

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